148 
g\llery in Moravia, likewise comprises several large- 
— foliated varieties of what was formerly consider¬ 
ed as common mica, such as that from Zinn- 
wald in Bohemia and Altenberg, accompanied 
by apatite, tinstone, and topaz.—The species and 
varieties of the talcose substances are likewise 
very imperfectly understood. Among the spe¬ 
cimen of talc in this glass case may be specified 
the common or Venetian (which enters into the 
composition of cosmetics) and the indurated 
talc, to the former of which may be referred 
the green radiated variety from Siberia, com¬ 
posed of distinct groups of small diverging 
laminae, and to which the name of pyrophyllite 
has lately been given ;— agalmatolite , (Werner’s 
bildstein, Haiiy’s talc glaphique,) employed by 
the Chinese for carving images, vessels, &c.;— 
chlorite , crystallized, in aggregated, small, modi¬ 
fied rhombic prisms ; the earthy and foliated 
varieties, coating crystals of octahedral mag¬ 
netic iron-stone, &c.;— pinite , crystallized in 
regular hexagonal prisms ; and giesecldte, from 
Greenland, which appears to be a variety of it; 
—fahlunite, which is considered as related to 
the latter, though but little is known of its 
chemical composition. 
Case 32. This and part of the following 
Case chiefly contain substances related to horn¬ 
blende or amphibolic minerals, among which 
may be specified the basaltic and common horn¬ 
blende , 
